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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94ba32cbe504e29708a556e24b6d16ae6cf31e932b9b655e3e2f7302526cdae3' 
  AND token = 'R91/hM1Jpcy5FOP7GlPq5yOqa9G/EX7xm9uSgcvNwJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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