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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ae2f9979ccf7ee889e0faa59d5d42bfea6fa4d2921f8bbc0e0fdc8631bd6622' 
  AND token = '67tbhNdBGgm7yFnknRuXmdL96/4ocMOE7/QhUlE+msU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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