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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb4ba8ecaf1ea40d16c9bf1386e59c7248533811c51d759b2dc4f8263725045c' 
  AND token = '1wWb2jvp/V0G77854zP0w9taeCZb3YYzf5KkNN9ReSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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