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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98efcf6a1b3fb84fbe4ed667bbc7624a6870887795041b4bb4f6d110c9b803d5' 
  AND token = 'R88iYUp8sDEu6jZ+K4JqNRZdVVmR7uJIH8/V0WxT2XI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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