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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b2bd5422d74ce3d1f3dc54472e5e6329b715e57db8137dfc927f08df2a43d1f' 
  AND token = 'Qzx9u2X7+EhthYRny7La2jouP7ASXCw1bcFleebGrpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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