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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c206fd8563955995c5bab2dcadf622557fb5ca0bf7c2e09ae0784cc768eccd63' 
  AND token = 'aaqfQAskgilB2TMGsZ6GUbZCo8sWbffENcrIsZr6mJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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