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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b0a30b247dd9fe7dd628601496d6059d6c7d8a436fe0048c081843d778e3b32' 
  AND token = 'zaskrTWD9kuM7l20kIIEMZIQyXv9V4VZ4L6hbW325ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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