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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2cd24c4d739bbee6d7cc1d60adae9bf3bad4e8e183f0e3d5cb79cf34179a2ea' 
  AND token = 'csiacPt4R5RZN0HqKIyDxM0c+WG5fS2rZ9wZGJ/WBsE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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