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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba16fab9c8cb7a551775b9b2b5d0486eb12752b3b5db5654715b30cdca1a48f8' 
  AND token = 'rpb9xN9RTj3l7VWlHZO82Ed6dVAncgGN2ddlJThqufs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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