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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a31eb9aa469ce99c3581b736a6927c97181e5307ce9f6798e4225647e1a8da15' 
  AND token = 'Qor6BcQeBVsE2L3AglhS2YTIO2qbnc7eFhnblsWbMNk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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