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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2854655b39853044dc01def64724a0aa2e8f0ebd21e33626b4add64e1f3d504' 
  AND token = 'xaY4v5IcuOpxQMqUNyZyXwchnkIgrvgokz8z1g9DESU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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