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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c6bc1be5fd3dc978090147431fd9295c5883b98a07a3e2c003145371ed9353' 
  AND token = 'k9hciItmG/ToHSHJ7I0DgWC3XmHeLJ0AOFZ/ca5KcXg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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