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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92046a4481b35b79527133337fc0ae96b89c4a5e0b85e8e8ef44ee225809a0c' 
  AND token = 'ga29VonRx2w+iYpKNIAZ/h9q1CwiwIfUiADao+0reF0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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