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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7fed55f89deb70c0f01c64ad9bbbd1ace7ff3b3e2ecf2a9d9c73a8174f5348' 
  AND token = '9iEFotu/uXbJKtCv6+DrCjYJd8DA0YXjJXfN/1T4WKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00069

JSON explain

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