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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e0628ba6c0bb3c0c7442a657b78a0c36c97a9cefd780954b80b8ee68e2fbf60' 
  AND token = 'HUWWRHwd4rvzmcG4F5om2Wv9u0U+SClDyq0pUx2Q5As=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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