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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edde7ec25aede732a638e1e49cd66c30ab7d7c01b9045381b95b9c1380f39158' 
  AND token = 'hwgHM/QS7xXweccZUyAl2IPln7rkdx1XT/s5oQ75g8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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