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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ea43648607e79451a1b2e298af0a7cf6d96b9deefe9d8076fbda94d0c24acf' 
  AND token = 'B69DXqM3ME7fAkqmjpl3OjPqbda9vSuRmTVRqugC8Es=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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