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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b760cb79c152d804eeb040e2d543c403d9cd51723a2b511254b5501437d3c81f' 
  AND token = 'rew3swRD9B6s7ExaWiYOQXRQ35cNMLen2Rneefh6Rv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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