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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b8494a1b4de6f6c92ebd563fef13c2938a71115a74cb30a53427c85e07f21fe' 
  AND token = 'qwraKk+c+dWSSbadD8Qg4DQLYhpsincHjxgYd677+c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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