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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1be96632baec90b016a8a7d3825151dd965a8922d786f55f8ee9afce8eacdc24' 
  AND token = 'iStnuo9vkUcSKdjmOWLzkNUgMrJ3UHGIvsaEWe/Mdmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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