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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '147684d633f6dcd7aa946aea0a6c25470905f50e78c79de1ea5869d61a630d15' 
  AND token = 'g149hJ01XrF4AzF/CCe4Ws/biIg8UjJcKSHPIS9p+0s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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