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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef47a2e706953c35fcdcf52b2a4aa18d9eb1cd449664c2aa9940aff9531ace64' 
  AND token = 'cIiyskmVx3bwgDzYG1bmqzw0Jh04NINaueSO35d+LwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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