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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eec4243156a2e931698a9f41aad447818ac7d4b045325d63f1807a98119abbe1' 
  AND token = 'oLyUMKg/b8jQ+UV+c8NWEUZJ4jSsvdCUzdJtkVI04Bk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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