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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19ba876665029279fa4c489548428048d2d027239c3ccdc5af5fe69d8b631ae2' 
  AND token = 'ZbIf6WZv4HdRcFHpupY0R7b6A8fU2rEbQIAXJE+vXiI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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