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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24abccc1f09303c1b8645df1000673561c0a68dccc49efcb56548badd69fd24c' 
  AND token = '9PKJV1HrcX9JkiWnO6mE5ZoLKAKRjSSHMV2BIchFZGc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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