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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b681408abcc4ff2297ea50e7d85f8a7417e202bf6f919c9688e9047bbeaec238' 
  AND token = 'JSSwEeBRf8TKlw1IqmHY7Bo+L8eY7fzf4Cnfs/XlU/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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