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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '65bd5a280ae0200a23a8fa53af9c88e851e9519ae1cf683c4b635a5d222b164c' 
  AND token = 'A2DiV8sSnEJaiKAPaex0Z2UNabQoEyyDh9VbEgn/Yvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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