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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40d5c5b07cc818407bf7f59cc680223cd9cd390c297a8e990c99990e5ca062a9' 
  AND token = 'nL3qK/fYWOw1f4lxsGaEi5VHwXLsRaIGeOCoeMTmrSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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