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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00c9005c19b8769d8327488948a89fc54f48d937c77dc2656f85214e60284dcd' 
  AND token = 'hi65GaU+WOxLxvUdruCCWDKfrspx79tumSsk83GzMEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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