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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1efcdd44366d501ba505757e80aa3d90a0d8196a55c601b6916b3f6bd440e1b0' 
  AND token = 'xwt5A3iKUihUIV4b/s9/ppQCHtQv37HcWQ98xr79rtE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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