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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d2e946f325b01b54dd26bef144b49de06d82045835bdba736ebdbd0d99a71e7' 
  AND token = 'Bg/5DF211BXZ/JDWEyY6eL5CfG7shMCZizEmkaOBlVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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