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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5aa70aca75c46316d96449ebc275692f9a1d854dc7812f82a9296e7d88ccb7b' 
  AND token = 'Q+tMW68j4GNkC9kw0jcGAIspZuQK/T/aCZGxZSdI6YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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