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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5e4e04558b8e966d737b02c1fd942865c1e7e4f1e59044105a150904dfa0c79' 
  AND token = 'NL9FZGYLqUCWpuqjOOZdflTqLCdU9k7Jv5J5CwwVliU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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