SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '465afab2df2582bd6df5baacdb05ff90f06dec34c9d5370e42d4d3790e84896a' 
  AND token = '25tDHhmNTZMEYZ33wLF+VLvztgjgMx1qY4XyXA6VfLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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