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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73731d3b90c6e931786b63ba3ca8bea4294308d9cc662222cd03449b9626eca7' 
  AND token = 'bB4KaaoXFgcGl/2eYrDZxe/cGteI/ZJOCxVd/X8+FVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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