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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cac974afce326a699bde3a5293143d81557739c0cd24ad7a0635e315943e6fb3' 
  AND token = 'fTKP/zeA6ufXuVbSXx0IhS5UlwyAh8KnVgrZeqg3FWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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