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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd708c1305bc3ca12382bc183164d5e469544c20b1cb8da6cf7feae7f0b010a2c' 
  AND token = 'z/uCfXSpCt4LwJfUgURW/jXQb87IsrOfkmhh3n/2i6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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