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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d75c8efb17af91091a8b74b56db4e50b0e6047d951a0b06d22382759b32fc62' 
  AND token = 'thBwrN554ddvDmD9ymZ1qlVO6ITue2C68FnSCJOaFR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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