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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc79b4afdce86fa80bfbdf2cc41ce4792c13e9949066196ce81105acce2f960' 
  AND token = 'WFuvnJhcQmTTYH0AS7H6NDEiLhOJsM8+0uLkMktVYZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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