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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1bcf655fa3e2ad6abf8726fc0d19119d1074d7f6efc410f5905e6f9a7bfed0a' 
  AND token = '3DyNeycpTlM9Hmwoc672KSsymZcHMNmZKX2FdQsfQUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}