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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc31e8248b112326e4347d20db02022bc9ecc2c05d36a9f904eee02bbebb4fc1' 
  AND token = 'sbqBWTSDAbqp7RfGugDB1wmNZQG1lqISrIlHbH7q4pM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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