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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd482351546b904138e5e564090db1fd51c05f71221c3ab314994490025a4fc5' 
  AND token = '4WS1sW0NfQFPr56vuka81OgEEelHzvr3sHxY/9TRT7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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