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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69db12985e99fbfa997b30277829acca2409e1a060045a47d1e5f9dd825e1629' 
  AND token = 'ZudCxE1LqKhcabNglzWPC0T6IGqnUzV+M3i49U1KPak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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