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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36c711dbe9a87dbf80657ab863caa2e2df1a3f252ef460665b6e70a68e434f25' 
  AND token = 'vCyGnETIrSUhe+F3z6L2zu8NWBstfUvfd4aJFEJ096w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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