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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6fe40eb417821c7ce03dafc3c0896b58b6ef03a90b56ddfcd51839933b1df34' 
  AND token = 'rflsoc49DDzNnt+x0k0uoCAK89txsYymgfQgm49+MXU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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