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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65770079adac4cd70f5ac579c9ec56f4244637282be3b5734c6a97c4c81704fb' 
  AND token = '6nkX9oRXsnVmHXEryqySpaB8B2Rk0C1esYtsbYYbOEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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