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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1326789b9a79899060b32a06636dadbea9d92d66bcecb993a76e5b2e402075fa' 
  AND token = 'WrB6ixYomqllU3/HpCiN38wjxGuFVH29fYYDQ+hBdWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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