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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921534c52a87e1a39c2daeec1b4b30cb98c17432f5b67c76974f86fc8def7a92' 
  AND token = 'HtD6DQ2RctHAyGgRKGs4APot95v+3QvP6ivU6oD1wxY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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