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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '929e03c07c13262ad3d1c2456371ea2d2106a09c1b6cda5d0ffb5a063c8f5f48' 
  AND token = 'mrq0Sd0w8vW/Mp8TjnJt624u+OvWVtfTyv99AxHnVaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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