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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48d28ff320667c44628ac470f63c222872d439d4e095b4106d1384edbabf5e42' 
  AND token = 'ObD1FQ2L2GWADwaQVb757DdBYWtI6CQY+ePbKUJje2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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