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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ba72af3b97bca5c53380d14c8a44a02fcbd1b7c208f0ef6dcc1c1732f079a6c' 
  AND token = 'Jdw76T85DnERYm5DnD4dqC2Oj1wML5vHkueWj/9biKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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