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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '489f914d3f61601b13e6aea8cdc8d0d4f483240a8db6d8076c23e5a21cea4dfb' 
  AND token = 'fzWRg0eARVNqPA18AwUlABdK/Eom76s9Bjp7aHCVuyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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