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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edd53d2d193e8d56d82abe7fd7d6d9471b119b87c90035540a05d1ceb96a6d36' 
  AND token = 'vyC9hU/BuTItIuO4CDooSEH1WFF1V/Uq1PWDHvoGJwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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