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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01dcb8e4d09874fe1466ae06ef2f023fb18c733a92ff6e27e7d1ee3cba6e94b3' 
  AND token = 'LnDvoSHHrV7hJbfj8GnTYgpJMimfHB61DXGGlrM8sW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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