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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feda21531ef73881ae944ab94067be4009be13d9fd829f39b80791b5715438c0' 
  AND token = 'cb9LWVZZwUHfg9VDgmeKdlzY2JAWv9FfnDgCMeML1Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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