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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4dd9b655bfec3f84c5b1074bf8caf935d5276152e1d20e8fc71a8c21fe27ae4' 
  AND token = 'wDkDyT+h4nWwdkbRMFfTIM5fHLR8W4nZBYJ5iQucKwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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