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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '610a8be64a719bf78e85b869e7aafa43f013014e3f223fd36bcb84d373c40698' 
  AND token = 'XfeE3+JIcwBHfV8ZO4unzBeu0v9sXJw9bN5E+s+FFHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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