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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b26d6e4f9e952135f029632c03127698a7b9f79baa22cf3b6f3ae9f85c9f2aed' 
  AND token = '5ouDSkdwHBeCqXURDk/ChonmiROZfQME4akk1CIoaa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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