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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e420362f3b6e4690ac54918bb7cb74f7f88fdfd6ac88fea11e20c281deb4bbe9' 
  AND token = 'LrimxMQWygXWM3ISCEY9F7nzuT03MxrA1QPa6HE/WYI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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