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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4284c033ac8838dd0f1503fe468512080454e6984934202843f96ee9ae9e8211' 
  AND token = 'nLl47hBBMwd50biEd5qMwopbjQy/k8EhCNjiY3vpMhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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