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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8ee1ee1de25b8a75c9d367f83869dc5945fe76b5125b9c461c1ed176ac4e482' 
  AND token = '5cib8Zw5hAJwsW6Dnypk3UbR7iHA0ihbdCaPbPVp6bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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