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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfa4475ebec19e132ec53f67b92037190ac20218e0f2de108440ba8b07cf5e63' 
  AND token = 'eLVpX/CGvas6cwt+uM7O8XSrBRmlLprItYdgxd2/nIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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