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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0864c8873cf218c0fa4b10ab8c4880e1de52f96c12cb8e8ced1acb66ccf5ad4e' 
  AND token = '4YNiEh4yn6p3vlYJaoWux7tyzYOK1OSommvM8S4WYoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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