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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '847185a35eb5885ef486792611ad116d395eef37541e3fb854b8186e8964804f' 
  AND token = '2xEcisZlSR7jBj0ERoQ/gJqynSaIkzUMXXGR0P4SlXM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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