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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94fa2930113f8519c698356c99c28447749a280c1b72420a30067c8c47ecbe67' 
  AND token = 'r1CwIq9xDO/Pp01Zhallb49RrumnC5VQCcs74qnGvR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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