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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd3943fb5b6fa6e97343f6e18c8956d8c9c1b06a919ed6899e3e34d3654c4e87' 
  AND token = 'Eok3586LVKwmP3MNrTOLgC4hHOl17+b3nQU/29oK698=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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