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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acebe136a569b3a30309ea9055cad9a5dec4d83455e9f302c50d16e01e1d052c' 
  AND token = '5rlXeU/dvEGLcqZ+O7fg8yTJP4LPTXSV0NIIAYf/A0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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