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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b64e8957e302eec0a6216ba0c3066c8112d2de778f7ccea1c35e6daffa6c292' 
  AND token = 'Jo/EIz25qQKKPbdaTwtXPYe83/vQLzDrw7z0LPd8mFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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