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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b81490a7630277b1013e73779769ecabb03837f38d5221354e083011d563ea' 
  AND token = '+mgg+VyOKVZHWZBT9OWObQIIIruDI3RVYOCw38PAOHc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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