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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe42a85b36112bcfc321896d1c70958f1d3a3962c596e9f75a461e07ae362f3' 
  AND token = '1/ocbCtpqx0aDddzWmteN30pPtGdxJkUmcCvQhMJ4d8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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